<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<script type="text/javascript">
			var str1 = "hello"
			var str2 = "world"
			console.log(str1 + str2) // "helloworld"	
			// 字符串+数值---数值转为字符串再拼接
			console.log("string"+2) // string2
			console.log("string"+2+4)// string24
		</script>
	</body>
</html>
